| Zugriffsnummer | 29037 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Current state of Avogadro 28Si sphere S8 |
| Autor(in); Institution |
Nicolaus, Arnold; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Bartl, Guido; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Bettin, Horst; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Borys, Michael; 1.1, Masse, PTB-Braunschweig
Firlus, Martin; 1.1, Masse, PTB-Braunschweig
Busch, Ingo; 5.1, Oberflächenmesstechnik, PTB-Braunschweig
Felgner, André; 5.1, Oberflächenmesstechnik, PTB-Braunschweig
Krüger-Sehm, Rolf; 5.1, Oberflächenmesstechnik, PTB-Braunschweig
Krumrey, Michael; 7.1, Radiometrie mit Synchrotronstrahlung, PTB-Berlin
Krystek, Michael; 5, Fertigungsmesstechnik, PTB-Braunschweig
Kuetgens, Ulrich; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
|
| Quelle/Jahr | IEEE Transactions on Instrumentation and Measurement: 62 (2013), 6, 1499 - 1505 |
| ISSN | 0018-9456 |
| DOI | |
| Verlag | New York, NY: IEEE |
| Freie Schlagworte | Avogadro's constant ; International System of Units (SI) unit ; kilogram ; measurement uncertainty |
| Zusammenfassung | In 2011, the first determination of the Avogadro constant with 28Si material was published with an overall relative uncertainty of 3 × 10-8. The results were based on measurements of a very pure single crystal of highly enriched silicon-28. Where the result of crystal properties, molar mass, and lattice constant could be performed with satisfying uncertainty, the measurements on the spheres made of the same crystal were overshadowed by an unexpected effect; the surface of both silicon spheres were contaminated by small amounts of copper (Cu) and nickel (Ni). Although the contaminations were quantitatively measured and their impact into the different quantities was taken into account, the Avogadro group was worried about its negative influence. With the knowledge of various etching procedures and after due consideration, a special chemomechanical technique was applied to remove the metallic contaminations. Herein, we describe the decontamination process, the subsequent measurements, and their impact on the overall uncertainty of the Avogadro constant. |
Zitierung
Nicolaus, A., Bartl, G., Bettin, H., Borys, M., Firlus, M., Busch, I., Felgner, A., Krüger-Sehm, R., Krumrey, M., Krystek, M., & Kuetgens, U. (2013). Current state of Avogadro ²⁸Si sphere S8. IEEE Transactions on Instrumentation and Measurement, 62(6), 1499–1505. https://doi.org/10.1109/tim.2013.2242633